Conservation Evidence strives to be as useful to conservationists as possible. Please take our survey to help the team improve our resource.

Providing evidence to improve practice

Individual study: Conservation efforts at the Tana River Primate Reserve, Kenya

Published source details

Else J.G. (1987) Conservation efforts at the Tana River Primate Reserve, Kenya. Primate Conservation, 8, 165-166


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Permanent presence of staff/manager Primate Conservation

A before-and-after trial in 1975-1985 in swamp and riverine forest in Tana River Primate Reserve, Kenya found that despite permanent presence of reserve staff along with other interventions, Tana River red colobus Colobus badius rufomitratus and crested mangabeys Cercocebus galeritus galeritus decreased over a ten year period. Overall population size decreased from 1,200-1,800 to 200-300 individuals (83% decrease) for colobus and from 1,100-1,500 to 800-1,100 individuals (25% decrease) for mangabeys. The number of forest patches inhabited by these two species also decreased over time. No statistical tests were carried out to determine whether this decrease was significant. Results of total counts in 1985 and in 1973-1975 were compared to estimate population change. A permanent ranger post to house junior reserve staff was built in 1976. In the same year, the area became a National Reserve and from 1977-1981, a tourism enterprise with a permanent lodge was established and maintained in the reserve. The study does not distinguish between the effects of the different interventions mentioned above.

Run tourist projects and ensure permanent human presence at site Primate Conservation

A before-and-after trial in 1975-1985 in swamp and riverine forest in Tana River Primate Reserve, Kenya found that despite the establishment of a tourism enterprise in the reserve along with other interventions, Tana River red colobus Colobus badius rufomitratus and crested mangabeys Cercocebus galeritus galeritus decreased over a ten year period. Overall population size decreased from 1,200-1,800 to 200-300 individuals (83% decrease for colobus and from 1,100-1,500 to 800-1,100 (25% decrease) individuals for mangabeys. The number of forest patches inhabited by these two species also decreased over the same time period. No statistical tests were carried out to determine whether this decrease was significant. Results of total counts in 1985 and in 1973-1975 were compared to estimate population change. A permanent tourist lodge was built in 1977 and was operated until 1981, offering game drives, boat trips and guided walks. In 1976, the area became a National Reserve including a permanent ranger post to house reserve staff. The study does not distinguish between the effects of the different interventions mentioned above.

Legally protect primate habitat Primate Conservation

A before-and-after trial in 1975-1985 in swamp and riverine forest in Tana River Primate Reserve, Kenya found that after proclaiming the study area a National Reserve alongside other interventions, resident populations of Tana River red colobus Colobus badius rufomitratus and crested mangabeys Cercocebus galeritus galeritus decreased over ten years. Overall population size decreased from 1,200-1,800 to 200-300 individuals (83% decrease) for colobus and from 1,100-1,500 to 800-1,100 (25% decrease) individuals for mangabeys. In addition, the number of forest patches inhabited by these two species also decreased over time. No statistical tests were carried out to determine whether these decreases were significant. Results of total counts in 1985 and in 1973-1975 were compared to estimated population changes. A permanent ranger post was built in 1976 and from 1977-1981, a tourism enterprise with a permanent lodge was established in the reserve. The study does not distinguish between the effects of the different interventions mentioned above.